Reaction of nitrous acid with aliphatic primary amine in the cold gives

Consider the following reaction. The product $X$ is used:

Electrophilic substitution of aniline with bromine in aqueous medium gives:

Identify the correct statements:
$(A)$ Primary amines do not give diazonium salts when treated with $NaNO_2$ in acidic conditions.
$(B)$ Aliphatic and aromatic primary amines on heating with $CHCl_3$ and ethanolic $KOH$ form carbylamines.
$(C)$ Secondary and tertiary amines also give the carbylamine test.
$(D)$ Benzenesulfonyl chloride is known as Hinsberg's reagent.
$(E)$ Tertiary amines react with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below:

Identify $M$ in the following sequence of reactions:

What occurs during the Hofmann rearrangement in the conversion of an amide to an amine?